import keyword
from decimal import Decimal

if True:
    print("hello world")
    print("hello world")
    print("hello world")
    print("hello world")
else:
    print("hello world")
    print("hello world")
    print("hello world")
    print("hello world")
print(11111)
print(keyword.kwlist)
num = 10
print(type(num))
num = "hello"
print(type(num))
#year = int(input("请输入一个年份"))
#print("您输入的数字是：",year)
str1 = 'h'
str2 = 'l'
str3 = 's'
print(str1,str2,str3,sep='-',end='\t')
print("888888")
print(3-2.6)
d1 = Decimal('2.6')
print(3-d1)
print(2/8)
print("*"*20)
num5 = 77
if 90 < num5 < 100:
    print("优秀")
elif 80 < num5 < 90:
    print("良好")
elif 70 < num5 < 80:
    print("及格")
else:
    print("不及格")